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Finding the Fourth Proportional to 20,788.17, 31,190.00 and 12,474.15

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Solution

The fourth proportional to 20,788.17, 31,190.00 and 12,474.15 is: 18,715.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,788.17 : 31,190.00 = 12,474.15 : x
  2. Step 2: Convert to fraction form
    20,788.17/31,190.00 = 12,474.15/x
  3. Step 3: Cross multiply
    20,788.17x = 31,190.00 × 12,474.15
  4. Step 4: Simplify right side
    20,788.17x = 389,068,559.17
  5. Step 5: Solve for x
    x = 389,068,559.17/20,788.17
  6. Step 6: Final answer
    x = 18,715.87

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